Role: Duncan AtwoodDuncan is Belle’s handsome and suave edtior. His publishing company, Atwood & Kalberg, published Belle's first book. Duncan is sophisticated, intense, confident and very 'grown up.' Belle thinks Duncan could be the person she could have a relationship with because he is worldly, been round the block and knows everything about her.

James on his character:At the beginning, you’re supposed to like him. He’s an intelligent, liberal man who’s totally at ease with Belle’s profession. He talks to her as a human being. She has not encountered many people like this, with whom she can fully be herself. But with her editor, she has no choice but to reveal herself. That’s a very vulnerable position for Belle, but what’s great about Duncan is that he’s very hip about that. He sees her simply as a person and isn’t the least bit judgemental about her lifestyle.

Plot: Secret Diary is based on two books, The Intimate Adventures of a London Call Girl (2005) and The Further Adventures of a London Call Girl (2006) and on a blog by a London prostitute and writer who uses the nom de plume Belle de Jour. The series depicts the life of a London prostitute, Hannah Baxter, who lives a secret life as a call girl under the pseudonym Belle. Her professional and private life often collide and she receives help from her best friend, Ben and fellow call girl, Bambi. Hannah narrates the series and sometimes she speaks directly to the audience. In Season 3, her romance with Duncan who is editing her second book, feature predominantly.

Trivia & Facts:- On 15 November 2009, the real Belle du Jour, whose memoirs were the basis for this series, revealed her true identity to be Dr Brooke Magnanti, a research scientist and former prostitute from Bristol. - Theme song for the series was You know I'm no good by Amy Winehouse

Quotes:James D’Arcy: Billie and I worked together on ITV1’s Mansfield Park. She is just such a delightful girl and a terrific actress. She has a quality that so few actors possess: you instantly like her. It doesn’t matter if you’re 16 watching her in Doctor Who or 65 watching her in Mansfield Park – you immediately connect with her. Billie’s appeal is completely natural – you can’t manufacture it. Some actors are adept at generating it, but Billie just has it effortlessly. That for me was the immediate attraction of working on Secret Diary of a Call Girl.

There were a couple of scenes where we were required to disrobe. Obviously those sequences are never natural, but they’re much easier when everyone is relaxed - and Billie is supremely relaxed. She’s been filming scenes like this day in, day out on Secret Diary of a Call Girl, so she’s very easy-going about them. If Billie is relaxed, then so is everyone else - and that makes it a million times easier to shoot. It also gives you great liberty to have fun. Those scenes can be extraordinarily, toe-curlingly awful or a really good laugh. On Secret Diary of a Call Girl, we had a really good laugh. And for that, I’m extremely grateful to Billie!